Sorry for the confusion. When you create a droplet using an ssh key there is no root password. The user is only allowed to authenticate using the key over ssh. You would have to log into your droplet with putty and run the command passwd which would then allow you to create a password for your root user that could be used on the console. Changes made to the ssh service don’t have any effect on the console. Your droplet sees it’s console as a local keyboard and display.